2017 AKRA Road Racing Tech Manual

Transcription

1 2017 AKRA Road Racing Tech Manual Table of Contents Disclaimer 1 Sprint Road Race Class Structure 2 Laydown Enduro Class Structure 6 Local Option Classes 8 General Rules & Regulations 9 A. Spirit and Intent 9 B. Driver Eligibility & Requirements 9 C. Protest Procedure 9 D. Points, Scoring, Year End 10 E. Miscellaneous Rules 10 Flags 11 Section 1 Foreword and Introduction 12 Section 2 Metrology 12 Section 3 Pre-Tech Requirements 13 A. Personal Safety Equipment Head Gear Neck Brace Driver Apparel 13 B. Kart Requirements General Ballast Steering Components Wheels and Tires Wheel Hubs and Axles Brakes Driveline Components Fuel Systems Cooling Systems 15 Section 4 Kart Types and Construction 15 A. Sprint Enduro Chassis Specifications 15 B. Laydown Enduro Chassis Specifications 16 C. Sprint Shifter Chassis Specifications 16 D. Super Kart Chassis Specifications 17 E. Enduro Bodywork General 17 F. Sprint Enduro Specific Bodywork 18 G. Laydown Enduro Specific Bodywork 18 H. Sprint Shifter Specific Bodywork 18 I. Super Kart Specific Bodywork 18 Section 5 Fuels and Lubricants 19 A. Two Cycle Fuels 19 B. Four Cycle Fuels 19 C. Fuel Testing 19 Version

2 DISCLAIMER It is the purpose of AKRA to create FAIR, FUN and SAFE racing programs on a worldwide basis within the Karting industry. Use of these Rules and Regulations require Tracks, Clubs, Promoters or Series be sanctioned by the AKRA. Any other use is strictly prohibited without the express written consent of the AKRA. ANYTHING, WHICH IS NOT EXPRESSLY ALLOWED, IS FORBIDDEN! AKRA reserves the Right to Refuse any and all entries, memberships and/or corporate participation at any or all sanctioned or series events. The rules and / or regulations set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. These rules shall govern the condition of all events; all participants are deemed to have complied with these rules. NO EXPRESSED OR IMPLIED WARRANTY OF SAFTY SHALL RESULT FROM PUBLICATIONS OF OR COMPLIANCE WITH THESE RULES AND OR REGULATIONS. They are intended as a guide for the conduct of the sport and are in no way a guarantee against injury or death to a participant, spectator, or official. These Rules are in conjunction with and published with the permission of TAG Racing International / Tag USA. Living Document This is a living document, and as such is subject to revisions and changes as deemed necessary to continue the integrity of the AKRA Road Racing program. Updates can be found on the AKRA, the Dart Kart Club, and the Michigan Kart Club web sites Version Page 1 of 19

3 AKRA Road Racing Sprint Road Race Junior Sprint Final 1 & Final 2 Competition Age: Engines: Yamaha KT 100, KPV 100, Animal, Pro Gas, LO 206. Weight: Yamaha-RLV SSX Exhaust 300lbs., RLV SBX 320lbs., KPV lbs., Briggs Animal 300lbs., Pro Gas 300lbs., LO lbs. Pipe: Yamaha -RLV SSX Can, or RLV SBX Exhaust. When using the RLV SBX Exhaust, use the RLV 26S Header, with a 7/8 RLV restrictor, with a minimum 11.0 flex length as measured from piston face to end of flex. Axle or Engine clutch. KPV KPV 2 pipe and header. Engine clutch only. Briggs Animal-Stock 6.5hp (See Animal Junior Rules). Dry engine clutch only. Fuel: Yamaha and KPV-Race Gas, Animal Gas or Alcohol, Pro Gas and LO 206 Pump Gas. Yamaha Sportsman Sprint Final 1 & Final 2 Engines: Yamaha KT 100 Weight: SBX 360lbs., SSX 340lbs. Pipe: RLV SBX Muffler, RLV 26S Header, Flex length minimum 11.0 as measured from piston face to end of flex. SSX Can Muffler. Yamaha Sprint Final 1 & Final 2 Engines: Yamaha KT 100 Weight: 360lbs. Pipe: Fixed Pipe. Yamaha Sportsman setup legal at 340lbs for SBX can and 320lbs for SSX can. Piston Port Sprint Final 1 & Final 2 Engines: Any mass produced 100cc Air Cooled Piston Port Engine Weight: Yamaha 360lbs., Comer P51 395lbs., all other Piston Port engines 380 lbs.. Yamaha Sportsman setup legal at 340lbs for SBX can and 320lbs for SSX can. Piston Port SSX Can Sprint Final 1 & Final 2 Engines: Yamaha KT 100, ARC Comer, PRD RK 100 Weight: Sprint Bodywork 360lbs., CIK Bodywork 350lbs. Pipe: RLV SSX Can muffler Version Page 2 of 19

4 Junior Novice Sprint Final 1 & Final 2 Competition Age: 8-12 Yamaha Sportsman KT 100S, 265lbs., Walbro-WA55B carburetor and manifold, RLV-SSX Can Muffler. Komet Sportsman KPV 100, 265lbs., Walbro-WA55B carburetor, KPV 1 pipe and header. Briggs Animal Sportsman Stock Animal with.505 Gold restrictor, 265lbs. LO206 Sportsman, LO 206 with carb lock and.490 restrictor-green slide, 265lbs. TaG Cadet CIK Bodywork, Gazelle 60cc 235lbs., Mini Swift 60cc 245lbs., RoK 60cc 245lbs. 4 Cycle International, Clone ARC/.550 Blue Restrictor, Pull Starter, 225lbs. or Pump Gas Open Sprint Final 1 & Final 2 Engines: Any non-gearbox 2 cycle up to 135cc, 80cc Gearbox engines, 4 cycle engines. Weight: Yamaha, ARC Comer, PRD RK lbs., All other Piston Ports 350lbs., 100cc Controlled Stock 365lbs., IAME KA lbs., all other non-gearbox up to 150cc 380lbs., 80cc Gearbox 375lbs., Open Modified Animals-Clones-Honda-Flatheads up to 300cc 340lbs., Stock Animal 300lbs., Limited Modified Animal 340lbs., Pro Gas 300 lbs., Clone/LO lbs., Honda GSX lbs., Open Modified Honda, Briggs, Tech Star, Blockzilla from 301cc-450cc 380lbs.. Fuel: 2 cycles - Race Gas, 4 cycles Methanol or Pump Gas. KPV Komet Senior Engines: KPV, K71, HPV Weight: With #3 pipe 340lbs. with flex set at With #2 or #4 pipe 360 lbs. with flex set at Pipe: #2, #3, #4 Fuel: Other: Race Gas K&N Filter allowed, open tire, 5.0 wheels only, 450 front only, 710 rear only, CIK bodywork, Sit-up sprint style seat, engine clutch only. Minimum overall rear tire width TaG Senior Sprint Final 1 and Final 2 Engines and Weight: Parilla Leopard 360lbs., PRD Fireball 350lbs., Rotax Max FR lbs., Rotax Max FR 125 EVO 400lbs., Vortex TT 405lbs., Motori Seven 415lbs., X30 370lbs., X 125-MX 360lbs., TM lbs., Sonik TX 390lbs., Sonik VX 380lbs., Ported Parilla Leopard 380lbs., Easykart 350lbs. TaG Senior Heavy Sprint Final 1 & Final 2 Engines and Weight: Parilla Leopard 390lbs., PRD Fireball 380lbs., Rotax Max FR lbs., Rotax Max FR 125 EVO 430lbs., Vortex TT 425lbs., Motori Seven 435lbs., X30 400lbs., X 125-MX 390lbs., TM lbs., Sonik TX 445lbs., Sonik VX 410lbs., Ported Parilla Leopard 410lbs., Easykart 380lbs. Version Page 3 of 19

5 TaG Masters Sprint Final 1 & Final 2 Competition Age: 35 and up Engines and Weight: Parilla Leopard 390lbs., PRD Fireball 380lbs., Rotax Max FR lbs., Rotax Max FR 125 EVO 430lbs., Vortex TT 425lbs., Motori Seven 435lbs., X30 400lbs., X 125-MX 390lbs., TM lbs., Sonik TX 445lbs., Sonik VX 410lbs., Ported Parilla Leopard 410lbs., Easykart 380lbs. Stock Honda Final 1 & Final 2 Competition Age: 16 and up Engines: Honda CR 125 (1999 or 2001 Cylinder) Weight: 390lbs., (RLV 6800, RCE T3, RLV R4 (Single or Two Piece), SKUSA SK-1) 125 Shifter Final 1 & Final 2 Competition Age: 16 and up Engines: Mass produced 125cc Shifter Motor. Weight: Stock Honda CIK Bodywork 375lbs., 2013 Homologated Modified Motor CIK Bodywork 385lbs., Full Bodywork 420lbs Motors Homologated 405lbs. (Stock Honda must run pipe legal for Stock Honda class) Fuel: Open Fuel G 125 Sprint Shifter Final 1 & Final 2 Competition Age: 35 and up Engines: 125cc Honda and 125cc ICC CIA/FIA engines (ICC engines stock 30mm Dellorto carb only) Weight: 420lbs. CIK bodywork only Motors Homologated 440lbs., (RLV 6800, RCE T3, RLV R4 (Single or Two Piece), SKUSA SK-1) Fuel: Open Fuel Other: Open Tire TaG Junior Sprint Final 1 & Final 2 Competition Age: Engines and Weight: Parilla Leopard 320lbs., PRD Fireball 320lbs., Rotax Max FR lbs., X30 330lbs., X 125- MX 320lbs., TM lbs. Restricted intake manifold with a 15mm intake opening. Pipe: Stock exhaust. 4-Cycle Junior Sprint Final 1 & Final 2 Competition Age: Engines: Briggs and Stratton Animal, Pro Gas, LO206, or Clone. Animal and Pro Gas with.575 black restrictor, LO206 with.570 restrictor and yellow slide, Clone with.550 Red restrictor. Dry engine clutch only. Weight: Animal 305lbs., Pro Gas 290lbs., LO lbs., Clone 280lbs. Fuel: Animal and LO206 Methanol, Pro Gas and Clone Pump Gas Version Page 4 of 19

6 4-Cycle Sprint 350 Final 1 & Final 2 Competition Age: 15 and older Engines: Briggs and Stratton Animal. Pro Gas legal under Pro Gas rules, LO 206 legal under LO 206. Dry engine clutch only. Weight: Animal 350lbs., Pro Gas 335lbs., LO lbs. Fuel: Methanol or Gas 4-Cycle Sprint 370 Final 1 & Final 2 Competition Age: 15 and older Engines: Briggs and Stratton Animal. Pro Gas legal under Pro Gas rules, LO 206 legal under LO 206. Dry engine clutch only. Weight: Animal 370lbs., Pro Gas 355lbs., LO lbs. Fuel: Methanol or Gas 4-Cycle Sprint 400 Final 1 & Final 2 Competition Age: 15 and older Engines: Briggs and Stratton Animal. Pro Gas legal under Pro Gas rules, LO 206 legal under LO 206. Dry engine clutch only. Weight: Animal 400lbs., Pro Gas 385lbs., LO lbs. Fuel: Methanol or Gas Clone/LO 206 Sprint Final 1 & Final 2 Competition Age: 15 and older Engines: Stock 6.5hp Clone Engine, Stock Briggs and Stratton LO 206. Dry engine clutch only. Weight: 370lbs. Fuel: Pump Gas Pro Gas Final 1 & Final 2 Engines: Briggs and Stratton Pro Gas, LO 206 Weight: Sprint style kart Pro Gas 360lbs., LO lbs., Enduro style kart Pro Gas 375lbs., LO lbs. Dry engine clutch only. Fuel: Pump Gas Limited Modified See Open Sprint located in the 2-cycle section Open 4 Cycle See Open Sprint located in the 2-cycle section Version Page 5 of 19

7 Laydown Enduro Class Structure Junior Enduro Final 1 & Final 2 Competition Age: Engines: Yamaha KT 100, KPV 100, Animal, Pro Gas, LO 206 Weight: Yamaha-RLV SSX Exhaust 340lbs., RLV SBX 360lbs., KPV 365lbs., Briggs Animal 340lbs., Pro Gas 340lbs., LO lbs. Pipe: Yamaha -RLV SSX, RLV SBX Muffler, RLV 26S Header, Flex length minimum 11.0 as measured from piston face to end of flex. Addition of a 7/8 restrictor required. KPV 2 pipe and header, engine clutch only. Briggs Animal-Stock 6.5hp (See Animal Junior Rules) Fuel: Yamaha and KPV-Race Gas, Animal Gas or Alcohol, Pro Gas and LO 206 pump gas. Yamaha Sportsman Medium Final 1 & Final 2 Engines: Yamaha Weight: SBX Muffler 385lbs., SSX Muffler 365lbs. Pipe: SSX Muffler, or, RLV SBX Muffler, RLV 26S Header, Flex length minimum 11.0 as measured from piston face to end of flex. Yamaha Sportsman Heavy Final 1 & Final 2 Engines: Yamaha Weight: SBX Muffler 410lbs., SSX Muffler 390lbs. Pipe: SSX Muffler, or, RLV SBX Muffler, RLV 26S Header, Flex length minimum 11.0 as measured from piston face to end of flex. Yamaha Pipe Final 1 & Final 2 Engines: Yamaha Weight: 400lbs. 100cc Limited Enduro Final 1 & Final 2 Engines: Any Piston Port Motor, Controlled Motors (Atlas, Dap T72, T80, T80A, T80R, T91, Hewland, Komet K11, K55, K78, K88, Parilla SS21, TT25, TT65, TT75, LMR, TKM FF99, RS98, S89, RL66. All motors are stock. Weight: Controlled 410lbs., Piston Port 360lbs. Pipe: Controlled - Fixed pipe, Piston Port either fixed of slippy pipe. Version Page 6 of 19

8 Controlled Final 1 & Final 2 Competition Age: 16 and up Engines: 100cc ICA Reed, 100cc Controlled, 100cc Piston Port Weight: ICA Reed & Controlled Fixed or Slippy pipe 390lbs., IAME KA lbs., Piston Port 340 lbs. Pipe: Fixed or Slippy pipe. All engines must run 1.75 header. Formula 100 Final 1 & Final 2 Competition Age: 16 and up Engines: Any 100cc Reed, Rotary, or Piston Port. Any 135cc Controlled Stock. Weight: 100cc Open 410lbs., Stock Appearing Piston Port 310lbs., 100cc Stock Appearing Reed or Rotary Valve 390lbs., 100cc Controlled Stock lbs., 100cc Controlled Stock prior lbs., 135 Controlled Stock 370lbs., IAME KA lbs. Pipe: Open Pipe Fuel: Open Fuel Formula 125 Final 1 & Final 2 Competition Age: 18 and up Engines: 125 Gearbox, 125 Non-Gearbox, B Limited, 100cc Open, 135cc Open. Weight: Gearbox 420lbs., Non-Gearbox 380lbs., X30 380lbs. Pipe: Gearbox - Fixed pipe. Non-Gearbox Open Pipe. Fuel: Open Fuel Unlimited Final 1 & Final 2 Competition Age: 18 and up Engines: Single Cylinder two cycle with maximum of 250cc, Single Cylinder Four Cycle with maximum of 450cc, Twin Engine maximum 150cc each cylinder. Gas Gas motor must run Super Kart. Weight: 250 CC - 460lbs., 450 CC 460lbs., 125 Gearbox or twin 135 cc engines - 420lbs., Up to 150cc Single Engine 380lbs., Two 100cc engines 465lbs., Two 150cc engines 490lbs. Fuel: Open Fuel Super Kart 250 Final 1 & Final 2 Competition Age: 18 and up Engines: Twin cylinder with a maximum of 250cc. Single Cylinder two cycle with maximum of 250cc. Single Cylinder Four Cycle with maximum of 450cc. Twin Engine maximum 150cc each cylinder. Weight: 250cc Twin Cylinder 490lbs., 250cc Single Cylinder - 460lbs., 450 CC 460lbs., 125 Gearbox or twin 135 cc engines - 420lbs., Up to 150cc Single Engine 380lbs., Two 100cc engines 465lbs., Two 150cc engines 490lbs. Fuel: Open Fuel Version Page 7 of 19

9 Vintage Piston Port/USA Final 1 & Final 2 Engines: Any American made, fan style kart engine (100cc and 125CC McCulloch, 135cc West Bend), Or Non-Fan - Yamaha KT 100, ARC, Dap T-50, TKM BT 82, PCR PP-100, PRD (Stock Only) Weight: No minimum weight Pipe: Any pipe, Horstman and SMC are the only wet axle clutches allowed, all other clutches allowed. Vintage Unlimited Final 1 & Final and up for twin engines. Engines: Any single 100cc 150cc. (Open Modifications, Any Carburetor allowed), Twin engine maximum displacement 280cc. Weight: No minimum weight Pipe: Any pipe, Any clutch. Fuel: Open Fuel Local Option classes (Others may be added) *Classes with multiple engines may have weights adjusted during the year. Additional classes may be added by the host club. Version Page 8 of 19

10 General Rules & Regulations The following rules are as stated General. There may be additional rules and regulations for each track and event. It is your responsibility to be familiar with the rules for each event that you participate in. These rules should be available in registration. If you do not understand a rule please ask a race official. A. Spirit and Intent Even if you are new to karting you may have heard the term spirit and intent. It is the concise description of how karting is run, pure, simple and undeniable. It is the law governing the sport of karting for the last 50 years. It means that you may be judged based on your perceived spirit and apparent intent for your conduct at any time at the track. Indeed, you should judge yourself using the same criteria. The law of spirit and intent comes into effect when race officials encounter karting situations or circumstances not specifically addressed in this rulebook. At this point, officials must make decisions based not only on fact, but also on whether the infraction was a clear case of attempting to controvert the spirit of the event. It is many times the hardest decision for an official to make. Nobody likes to invoke the spirit and intent rule. We urge you avoid causing a spirit and intent ruling by being fully aware of all the regulations that apply to you and your kart. It is impossible to write a rule for every aspect of karting. Before attempting modifications to your kart that are not specifically addressed in the rulebook talk to the technical inspector and clarify the requirements. You should intend to compete successfully, but if your intent is winning by circumventing the rules, then you should reconsider your involvement in this sport. B. Driver Eligibility & Requirements 1. You must be entered in a class in order to practice in all AKRA sanctioned events. 2. You must be an AKRA member, in good standing, in order to receive year-end awards. The highest qualifying AKRA member will be crowned class champion. 3. The kart is the official entry in the race. Once a lap has been made in a race with the entered kart, the kart cannot be changed without the permission of the race director. a. Relief Drivers must meet all class rule requirements and be approved by race officials. The driver of record must make one lap or the kart must remain in the pits until the lead kart has made one lap. A separate fee of $10.00 must be paid prior to the race by the relief driver. 4. Minimum driver age is listed in all class structures. However, if during the racing season, the driver has a birthday that would make them old enough to move to an older class, they will have the option to move up at any time during the racing season, with the exception of the Novice class. If a driver chooses to move up to a senior class, he may not move back to a junior class. All drivers must produce a current state photo I.D. card or certified birth certificate upon request. A minor s release is required for all persons under the age of 18. C. Protest Procedure All protests must be submitted in writing and acknowledged by an official in registration or post-race tech within 30 minutes of completion of the race that is being protested or, in the case of a scoring protest, within 30 minutes after official results have been posted. Protests will not be accepted after 30-minute period has expired. A protest can only be submitted by an entrant from the same class that is being protested, and can only be signed by one entrant. Once the official has accepted a protest, additional protests for the same infraction will not be accepted. Official protest forms will be made available in registration and post tech. Any national race disqualification or suspension can be appealed in writing to the AKRA advisory committee. Version Page 9 of 19

11 D. Points - Scoring Year End Awards 1. To receive points, the driver must be properly entered in the class, grid, weigh, and pass post-race tech. 2. Entrants will be required to place a scoring transponder on their kart in a location that is recommended for proper signal strength. It is the driver s responsibility to securely fasten the scoring transponder in a proper location prior to entering the track. 3. To receive year-end awards in each class the entrant must be a current AKRA member in good standing. 4. In the event of a tie in the year end point total, the tie will be broken by the highest finishing position of the last race either or both drivers competed in. 5. Disqualification: In the event that a driver is disqualified from an event for unsportsmanlike conduct on or off the racetrack he may NOT use that race as a drop race. If a driver is disqualified for mechanical failure on the track, improper driving, post-race engine, oil or fuel tech or at the scales in post tech he may use that as a drop race. However, if repeatedly disqualified for any reason the driver may be subject to penalty of not being able to use a race as a drop race. Competitors disqualified will receive zero (0) points for that race. 6. Bonus points will be awarded to competitors that meet the following criteria: Enter the same class on the same day at both MKC events and earn 5 bonus points. Enter the same class on the same day at the DKC events and earn 5 bonus points. Enter all 10 races in the same class and earn 5 bonus points. The maximum number of bonus points is 25. Example: MKC Saturday 5 points, MKC Sunday 5 points, DKC Saturday 5 points, DKC Sunday 5 points, Bonus for all 10 races 5 points. The bonus points will be added to the yearend total. 7. In the event of a rainout all entrants will receive 100 points plus the number of entries. If the race is run under wet conditions and a competitor chooses not to race they will be awards the next finishing position after the competitors that raced. You must weigh and pass tech to receive points unless this is waived by the race director. Example: 10 competitors in the class and 3 choose to race in the rain and 7 choose not to. The 7 that choose not to will receive 4 th place points. 8. Final results will count your best 7 of 10 finishes. You must run a minimum of 6 races to qualify for yearend awards. 9. The following point method will be used for calculating season points: Position Points number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries number of entries All remaining positions will receive 20 points + number of entries. E. Miscellaneous Rules 1. The pit lane will be a yellow flag condition and a safe speed will be maintained. No passing will be allowed entering the pit lane. Passing and/or unsafe driving in the pit lane will result in disqualification. 2. Data acquisition is legal in all classes. 3. Radio communication is legal in all classes. It may not be used for the purposes of intentional blocking. 4. Approved exhaust silencers or mufflers are mandatory in all classes. 5. Drivers are responsible for their pit crewmembers. Unacceptable behavior may subject the driver to disqualification from an event. Verbal and/or physical abuse or threats directed at any individual at any event will subject the offender to immediate ejection from the event and/or a 1-year suspension. 6. All individuals entering the event site must sign and execute all insurance related documents as prescribed for that event. 7. Pre-Race driver s meetings are mandatory. If you are unable to attend the drivers meeting, you are required to check in with the race director. Version Page 10 of 19

12 8. Vendor fee of $ per event will apply to anyone selling product or service at any and all series events with the exception of series or class sponsors. 9. AKRA reserves the right to refuse any and all entries at any event(s). 10. Helmet tethers are legal but cannot be in any way attached to the kart. Can only be attached to the driver. 11. It is the host club and race director s decision on rain racing. The host club may not allow racing on a wet track. If the race is declared a rain race and the race is started, then competitors choosing not to compete in the rain race will receive points based on the last competitor that gridded for the race. 12. Full and Temporary memberships available either online at AKRA or available at the track. 13. Go Pro type cameras must be mounted securely to the kart. No helmet mounting allowed. Flags Checkered Flag The race is finished. Slow to a moderate pace for exiting the track. Proceed slowly to the post tech area. Black Flag Racing is not a contact sport, although it is understood some inadvertent contact will occur, intentional and avoidable bumping, nerfing, pushing, etc., will be grounds for disqualification. You may be warned only once with a rolled black flag; second warnings will result in a waved black flag. Rolled & pointed: A warning about driver conduct Waved Black Flag: You must exit the track immediately you have been disqualified for a driving infraction. If a participant ignores the black flag along with his/her number being displayed by the flagman, that person will be disqualified for that day. Meatball Flag (Black with a red ball): Will be thrown for technical or mechanical problems, requiring the driver to stop for consultation. The flag will also be used for a pushing stop & go. Red Flag The race has been temporarily halted. Slow to a safe stop, drivers shall proceed safely to the starting grid under direction of the corner workers and flagman. Please be aware drivers are to follow track specific procedures as given by the race director prior to the race start. If the red flag occurs prior to the halfway point in a race it will be restarted. Restarts will be in the same order as the original grid. Scoring will continue from the last fully completed lap. If the red flag occurs at or after the halfway point it will be a completed race and the results will be the last completed and scored green flag lap. Any kart or driver flipping over (turning over) causing a red flag will not be allowed to restart. Any driver leaving the racetrack, due to an accident, by ambulance will not be allowed to restart. Any driver causing a red flag may be subject to not restarting or disqualification, as determined by the race director. Any kart involved in an accident whose driver is transported to a health care facility is subject to post tech. If driver does not return from the health care facility prior to the end of post tech, scales will be waived. Green Flag The racetrack is clear for racing. Black and Checked Flag The race is completed and is subject to an official protest by the race director. Yellow Flag There is a need for caution. There is something in the track ahead and you and before the next flag stand. You should proceed with caution. If the flag is waving, there is a problem in that section of the track. No passing will be allowed in that section when a waving yellow flag is displayed. Yellow with Red Strip Flag There is a need for caution. There is some debris, fluid or oil on the track ahead and you should proceed with caution. NOTE: Flags can vary from track to track. If there is a variation from the above, it will be brought up at the drivers meeting. Version Page 11 of 19

13 Version Page 12 of 19

14 Section 1 - Foreword and Introduction The following document and those that support it are authored with one intent the clarification and consolidation of the technical performance rules that govern kart racing. As such, the primary issues dealt with in this manual are those metrics from which a direct performance gain may be achieved by violation. Kart standards are also addressed in this manual though no implication of safety is made or warranted if the rules specified herein are adhered to. Personal conduct is not directly addressed in this manual as it is expected that the competitor, builder, inspector and administrator will conduct themselves in a manner conducive to orderly and proper results. The sport of karting has always been governed by the rule of spirit and intent. No effort is made here to change that. No pretense is made that the documentation herein will cover every situation that can be encountered in technical inspection. The ultimate responsibility for chassis and engine legality lies with the competitor. Should the competitor encounter a situation that is not specifically addressed in this manual it is his responsibility to get clearance from the technical inspector prior to using the kart in a race. Should the technical inspector encounter a situation in post race technical inspection that is not specifically addressed in this manual it is his responsibility to make a determination of legality based first on whether or not the modification represents a definable performance gain and ultimately on the spirit and intent of the competitor/builder. If, in the opinion of the technical inspector, the spirit or intent of the modification was clearly that of circumventing the rules to provide performance gain then he has the right to disqualify the competitor based solely on these criteria. When confronted with this scenario the inspector must weigh the decision carefully and use discretion, insight and integrity. In all cases, where series specific rules contradict the rules specified herein the series specific rules shall have precedence. There is no expressed or implied warranty given here in regards to safety if the rules herein are adhered to and the authors and authorizers of this document are to be held harmless in any litigation or actions as a result of accident. Section 2 - Metrology Wherein this manual deals specifically with dimensional conformity to specifications some discussion regarding measurement and gaging is necessary. Field metrology is limited and handicapped by a number of factors including, but not limited to, available measuring instruments and environmental conditions. The inspector must give some consideration to measurement uncertainty especially when approaching a dimension s limits of acceptability. Especially when a dimension as measured exceeds its tolerance limits the inspector must ensure that the best and most accurate available method of measurement is being employed prior to a disqualification decision being made. The inspector may take whatever steps he deems necessary to ensure proper results, including impound and inspection at another location. Method of measurement in all cases is at the sole discretion of the inspector. The preferred method will be designated later in this manual under generic technical procedures. Standard industrial metrology techniques shall be used as a guideline for methods used in the field. All dimensions given in this manual will either be toleranced or designated as maximum or minimum. Limits of size are absolute and are not to be rounded to the nearest whole integer to facilitate acceptability; i.e. a.500 diameter max hole that actually measures.5001 is to be found out of tolerance and not rounded to.500. The exception to the limits of size rule is when measuring nominal sized tubing or bar stock. This material comes from the manufacturer with rather generous tolerances and this must be considered when inspecting same. If nominal is noted on the element in question, a tolerance of +/-1/32 inch is generally acceptable with consideration to spirit and intent. Many of the inside (width of slot, diameter, etc.) dimensions found in this manual are listed as maximum. Wherever possible, a gage of maximum size shall be employed to measure these dimensions. For example, a.500 max diameter should be measured with a.500 gage pin. If the gage enters the feature in question it shall be found out of tolerance. For designated inside minimum dimensions a gage of minimum size shall be employed. For example, a.625 minimum diameter should be measured with a.625 gage pin. The gage must pass through the entire area in question with light, torsional, finger pressure. Perceptible drag on engagement is not reason for disqualification as long as full feature engagement may be achieved. All gages and measuring instruments must be calibrated to standards with a direct line of traceability to the National Institute of Standards and Technology a minimum of once per year. Visual checks of gaging should be performed periodically to ensure that damage has not occurred. Whenever possible, all inspections should be performed with components and gages at ambient temperature. Version Page 13 of 19

15 Section 3 - Pre-Tech Requirements A. Personal Safety Equipment 1. Head Gear a. Full-face helmets designed for competitive motorsports use, that comply with Snell Foundation specifications SA or M 2015 (expires 12/2025), SA/K or M 2010 (expires 12/2020), CMS 2007 Youth (expires 12/2019), CMR 2007 Youth (expires 12/2019), CMS 2016 (expires 12/2026), CMR 2017 (expires 12/2026), SFI 24.1/2010 (expires 12/2020), SFI 31.1/2010 (expires 12/2020), SFI 41.1/2010 (expires 12/2020), SFI 24.1/2013 (expires 12/2023), SFI 31.1/2013 (expires 12/2023), SFI 41.1/2013 (expires 12/2023), BSI A-type and A/FR types are legal for 10 years after date of manufacture.. Helmet must be available at pre-tech inspection. Helmets must be secured with a strap. Failure to do so will result in disqualification. A full visor, integral with the helmet, is mandatory. 2. Neck Brace a. Collar-type, unaltered neck brace designed for motorsports use are mandatory in all sit up classes. Loss of neck brace during an event will cause a black flag with an orange circle meatball flag to be given to the driver losing the neck brace. He must immediately proceed to the pits, and may replace the missing neck brace and then return to the race or practice session. 3. Driver Apparel a. Drivers are required to wear either full abrasion proof driver s suits, jackets made of leather, vinyl, abrasion resistant nylon, or equivalent, and full length pants. Gloves, socks, and shoes are mandatory. b. If driver s hair extends appreciably below the helmet it is mandatory that the driver wear a head sock or balaclava to prevent the driver s hair from extending below the helmet. c. Loose clothing, bandanas, scarves, hoods, loose belts, etc. are not allowed. d. All personal safety equipment is subject to, and shall be available for, pre-tech inspection. B. Kart Requirements 1. General 2. Ballast a. The kart must be neat in appearance, in good repair, and show quality workmanship. b. The kart must meet the requirements set forth in the AKRA Tech manual for its particular class. c. Rear view mirrors are allowed as long as they are mounted to the kart. No hand mounted mirrors allowed. d. European style clevis snap pins shall be safety wired. a. All weights added to the kart will be painted white and must be securely fastened to the kart with a minimum 5/16-inch diameter bolt. Any single weight weighing in excess of seven pounds shall utilize a minimum of two 5/16-inch minimum diameter bolts. b. All bolts used to fasten weights to the kart must be cotter keyed, safety wired, or double nutted. 3. Steering Components a. All steering component bolts, and nuts, must be cotter keyed and/or safety wired. Specialized bolts on European chassis must use factory clips. b. All steering component bolts, must be a minimum Grade 5 rating. c. All rod ends must have universal type swivel joints and jam nuts. d. Fasteners used on any component that will enable adjustment of camber, caster, etc. must be cotter keyed and/or safety wired. e. Steering Shafts 1. Solid steering shafts shall be a minimum.625-inch diameter, made of cold rolled steel, and one-piece design. Welding the steering wheel or hub to the shaft is not allowed. Shaft extensions, and cutting and welding the shaft to alter its length are not allowed. The steering wheel must be secured to the shaft with a nut or cap screw in the axial position. 2. Hollow steering shafts shall be a minimum.700-inch diameter, with a minimum wall thickness of.070 inch, made of steel tubing, and one-piece design. Welding the steering wheel or hub to the shaft is not allowed. Shaft extensions, and cutting and welding the shaft to alter its length are not allowed. The steering wheel hub must be secured using a 5/16-inch minimum diameter bolt through the axis of the shaft. 3. Tiller, vertical shaft steering systems are not allowed. Version Page 14 of 19

16 f. Steering Wheels 1. Steering wheels may be circular, with a ten-inch minimum diameter, and a minimum of three spokes. 2. Steering wheels may be of the butterfly type, with a ten-inch minimum diameter, and four spokes, and a minimum grip length of five inches on each side. 4. Wheels and Tires a. Pneumatic tires designed specifically for racing only. 1. Minimum 9.0-inch diameter. Maximum 12.5-inch diameter. 2. Maximum width, mounted on wheel inches b. Wheel balancing weights shall not exceed ¼ ounce each. 1. It is recommended that additional tape be placed over stick on type weights. c. G-Rings or lateral supported wheels are not permitted. 5. Wheel Hubs and Axles a. Wheel hubs and axles shall be constructed of metallic materials. b. Rear axles shall be one-piece design, driving both wheels. 1. Either solid or hollow axles are allowed inch minimum diameter inch maximum diameter. 3. Axles over inch diameter shall be constructed of ferrous material. 4. Snap rings or similar fasteners are required at both ends of the rear axle for American axles from 1 to 1 3/8 in diameter. 5. Axle stiffeners are allowed as long as they are secured by cotter key, circlip, or through bolted. 6. Axle may not protrude beyond the outside of rim and tire. 7. Any device that allows the rear wheels to rotate at different speeds is not allowed. c. Front axles 1. Front axle nuts must be secured with safety wire, cotter keys or circlips. 2. Ground ball or roller type bearings only, and must be adjusted so there is not excessive play. Split race type bearings are not allowed. 3. The spindle axle may not protrude beyond the outside of rim and tire. 6. Brakes a. Karts must, at minimum, have a braking system capable of braking both rear wheels equally and adequately. b. All Karts must have a tether attached from each available master cylinder to the brake pedal in addition to the brake rod. Tether must be a minimum of 1/16 or.0625 and adequately clamped to act as a backup if the linkage fails. Must be adjusted to function as intended. c. All laydown enduro clutch classes and all Gearbox classes unless otherwise noted require the use of a dual braking system. A dual braking system consists of two front, and one rear or Dual rear calipers. This shall consist of two independent and separate systems, operated by separate master cylinders. 1. One system must be fully functional if either system fails. d. All brake system fasteners, including pedals, clevis pins, and master cylinder roll pins, must be safety wired or cotter keyed. If safety wiring or cotter keying is infeasible, as in the case of some brake pad fasteners an appropriate thread locking compound shall be use to prevent loss of the fasteners. 1. All-metal locking type nuts to secure the brake disk or drum to the hub are allowed in lieu of safety wire or cotter pinning. 2. If the pedal is mounted to the front bumper, the bumper must be welded to the frame, or through bolted or pinned, and the through bolts or pins shall be safety wired or cotter keyed. 3. Hydraulic brake fittings shall be tight and leak free. Hydraulic brake lines shall be routed in a fashion, so as to not wear through, or be pulled loose. 4. Master cylinder actuating rod must be.250-inch diameter minimum or equal quality cable with positive stops on both ends. 5. Minimum disc measurements are 7.0 diameter X.125 thick. e. No carbon fiber components allowed. Version Page 15 of 19

17 7. Driveline Components a. Clutches are mandatory in all classes except those designated as direct drive. Oil Bath or dry styles allowed. 1. Oil bath clutches are allowed as long as they are sealed to prevent leakage. 2. If outboard clutch mounting is used, a third bearing support or guard to contain the clutch in the event the crankshaft breaks is mandatory. Clutches mounted inboard are not required to have a support or guard. 3. Transmissions or other devices that allow the change of gear ratios while the kart is in motion are not allowed, except in shifter classes. Torque converters are not allowed. b. Chain and Belt Guards 1. All karts shall be equipped with a chain or belt guard. Outboard drive systems will be allowed only if the chain or belt, and sprocket are completely enclosed from the front, top, rear, and sides. 2. Any sprocket not used for driving the kart must be fitted with a device to prevent exposure from any angle, or be completely encircled with a chain. 3 Chain oilers up to 8-ounce capacity are allowed. Competitors using chain oilers shall use a drip pan while on the grid. If a chain oiler is the highest point on the kart it must be protected with a roll bar, not to exceed 26 inches high from the ground. 8. Fuel Systems a. No pressurized fuel delivery systems allowed. No fuel injection systems allowed. b. Fuel capacity: Laydown enduro no capacity limit. All others 9-liter maximum capacity. Fuel tanks must be constructed of puncture resistant material, and have a secure leak proof closure. Limited Modified 4 cycles may run two separate tanks. c. Fuel lines must be safety wired, clamped or zip tie wrapped at all connection points. d. Fuel tanks must be securely bolted to the primary structure, frame, or floor pan. e. Fuel tanks on sprint karts must be located between the frame rails, and beneath the steering shaft. If a secondary sump tank is used it must be mounted in front of the motor. f. The length of fuel line shall be only of adequate length to supply fuel to the carburetor. Extensive fuel line length is not allowed. g. If other than metallic side tanks are used on an enduro kart, the use of double rail nerf bars per the AKRA tech manual is mandatory. h. If a fuel tank is the highest point on the kart it must be protected with a roll bar, not to exceed 26 inches high from the ground. i. If pump-around or recirculating type fuel delivery and evacuation systems are used, a positive, free vent to atmosphere must be employed on the fuel tank to prevent tank pressurization. 9. Cooling systems a. Coolant may not contain any Glycol based material. b. Water wetter or other surfactants may be added. c. Must be mounted to right or the left of the driver. e. After market water pumps are allowed, but must be driven by the rear axle. Internal engine pumps legal. Section 4 - Kart types and construction There are four different types of racing karts described herein. A general description of a kart chassis is a welded, tubular steel spaceframe. Side nerf bars, front and rear bumpers are required, except as noted. Aerodynamic bodywork covering the chassis is permitted but not required in any type except as noted. While overall construction of each is similar there are significant dimensional differences and as such will be detailed separately below. A. Sprint Enduro Chassis Specifications 1. Main frame members shall be constructed of cold rolled, electric weld, round, steel tubing or other material of equal or greater strength, of one-inch minimum nominal outside diameter and.083-inch minimum wall thickness. Main frame rail members shall be no higher than a horizontal line extending from the centerline of the front wheel to the centerline of the rear wheel. No oval tubing allowed. 2. Wheelbase: 43.0 inches maximum, 40.0 inches minimum. Wheelbase is measured from true axle centerlines, each side. 3. Track width: 28.0 inches minimum. Track width may be measured from the outside edge of one tire to the inside edge of the opposite tire when both tires are of identical width. 4. Overall width: 50.0 inches maximum for all classes except four cycle classes inches maximum for all four-cycle classes. Overall width is measured at any cross section of the kart, perpendicular to the longitudinal centerline axis. 5. Overall length: 74.0 inches maximum. Overall length is measured at any cross section of the kart, parallel to the longitudinal centerline axis. 6. Overall height: 26.0 inches maximum. Overall height is measured such that all elements of the kart must pass under a bar set parallel to ground level, 26.0 inches above ground level. Version Page 16 of 19

18 7. Dry kart weight: 85 pounds minimum in race ready trim without fuel. 8. Front bumper: If CIK-style nose cone is not used all components shall be constructed of round, steel tubing of.750-inch nominal diameter minimum. The upper hoop of the bumper must be supported by a minimum of two vertical uprights. These uprights must be within.50 inch of vertical when measured 3.0 inches down from the top of the top hoop. The uppermost tangent point of the top hoop must be 7.75 inches minimum from ground level. Otherwise, front bumper must conform to CIK specifications. 9. Rear bumper: If CIK style bumper is not used all components shall be constructed of round, steel tubing of.750-inch nominal diameter minimum. The uppermost tangent point of the top hoop shall be 7.5 inches maximum from ground level and above the lowermost tangent point of the rear axle minimum. Minimum width shall be no less than the lateral distance between the main chassis frame rails as measured at the rear of the kart. Maximum width shall be no wider than the rear overall width of tires. Continuous loop type bumpers with vertical or angled supports are allowed. The lower bar of this type must be below the rear axle, the upper bar no higher than the top of the rear tires. Bar must be in place from frame rail to frame rail. If CIK plastic bumper is used it may extend beyond the rear tires. 10. Nerf bars: If CIK-style side pods are not utilized nerf bars must be double rail type. All components shall be constructed round, steel tubing of.750-inch nominal diameter minimum. Overall height from uppermost to lowermost tubing tangent points shall be 6.0 inches minimum. Vertical uprights are mandatory at the leading and trailing ends of the nerf bar, creating a closed, rectangular construction. The leading and trailing vertical uprights must be positioned such that the smallest gap created between the front and rear tires respectively measures 3.0 inches maximum. If CIK-style side pods are utilized nerf bars must conform to CIK specifications. 11. Seat: Must be of conventional, unaltered, bucket type, molded construction, designed to keep the driver s posterior in place without undue movement. The seat shall be mounted between the main frame rails. The lowermost point of the seat must be positioned no lower than the lowermost point of the adjacent frame rails and no higher than the uppermost point of the adjacent frame rails. Height of the uppermost point of the seat backrest is 12.0 inches minimum from ground level. The rearmost point on the seat may not extend beyond the back of the rear axle. Steering uprights shall be positioned in such a manner as to prevent the driver s posterior from being positioned forward of the bucket portion of the seat. Seat Rules for CIK body work classes: Sit-up sprint style seat only, 13 minimum height cannot pass the rear axle, CIK style seats are defined as Sprint style bucket seats un-altered. Headrests are permitted. They must be attached to the seat and cannot extend past the rear of the bumper. TaG classes are not permitted to run headrests. 12. The use of any type of suspension components is strictly prohibited. B. Laydown Enduro Chassis Specifications 1. Main frame members shall be constructed of cold rolled, electric weld, round, steel tubing or other material of equal or greater strength, of 1.0-inch nominal minimum and 1.40-inch nominal maximum outside diameter. For nominal outside diameter tubing of 1.0 to inch the tubing wall thickness shall be.078 inch minimum. For nominal outside diameter tubing of greater than inch the tubing wall thickness shall be.060 inch minimum. Oval tube frames must receive prior approval from tech director. 2. Wheelbase: 50.0 inches maximum, 40.0 inches minimum. Wheelbase is measured from true axle centerlines, each side. 3. Track width: 30.0 inches minimum. Track width may be measured from the outside edge of one tire to the inside edge of the opposite tire, when both tires are of identical width. 4. Overall width: 50.0 inches maximum for all classes. Overall width is measured at any cross section of the kart, perpendicular to the longitudinal centerline axis. Air filters may extend beyond the 50.0-inch maximum. 5. Overall length: 97.0 inches maximum for single engine karts; inches for dual engine karts and shifter karts. Overall length is measured at any cross section of the kart, parallel to the longitudinal centerline axis. 6. Overall height: 26.0 inches maximum. Overall height is measured such that all elements of the kart must pass under a bar set parallel to ground level, 26.0 inches above ground level. 7. Dry kart weight: 85 pounds minimum for single engine karts; 105 pounds for dual engine karts in race ready trim without fuel. 8. The use of any type of suspension components is strictly prohibited. 9. Vintage Karts Only No bodywork allowed. Floor pan cannot extend beyond the chassis frame rails or the factory floor tabs. Horstman is the only legal wet axle clutch. 10. Rear bumper: All components shall be constructed of round, steel tubing of.750-inch nominal diameter minimum. The uppermost tangent point of the top hoop shall be 7.5 inches maximum from ground level and above the lowermost tangent point of the rear axle minimum. Minimum width shall be no less than the lateral distance between the main chassis frame rails as measured at the rear of the kart. Maximum width shall be no wider than the rear overall width of tires. Continuous loop type bumpers with vertical or angled supports are allowed. The lower bar of this type must be below the rear axle, the upper bar no higher than the top of the rear tires. Bar must be in place from frame rail to frame rail. C. Sprint Shifter Chassis Specifications 1. Main frame members shall be constructed of cold rolled, electric weld, round, steel tubing or other material of equal or greater strength, of one-inch minimum nominal outside diameter and.078-inch minimum wall thickness and inch maximum nominal diameter. Tubing of inch nominal and greater may have a wall thickness of.060-inch minimum. Main frame rail members shall be no higher than a horizontal line extending from the centerline of the front wheel to the centerline of the rear wheel. No oval tubing allowed. 2. Wheelbase: 43.0 inches maximum, 40.0 inches minimum. Wheelbase is measured from true axle centerlines, each side. Version Page 17 of 19

19 3. Track width: 28.0 inches minimum. Track width may be measured from the outside edge of one tire to the inside edge of the opposite tire when both tires are of identical width. 4. Overall width: inches maximum. Overall width is measured at any cross section of the kart, perpendicular to the longitudinal centerline axis. 5. Overall length: 84.0 inches maximum. Overall length is measured at any cross section of the kart, parallel to the longitudinal centerline axis. 6. Overall height: 26.0 inches maximum. Overall height is measured such that all elements of the kart must pass under a bar set parallel to ground level, 26.0 inches above ground level. 7. Dry kart weight: 85 pounds minimum in race ready trim without fuel. 8. Front bumper: If nose cone is not used all components shall be constructed of round, steel tubing of.750-inch nominal diameter minimum. The upper hoop of the bumper must be supported by a minimum of two vertical uprights. These uprights must be within.50 inch of vertical when measured 3.0 inches down from the top of the top hoop. The uppermost tangent point of the top hoop must be 7.75 inches minimum from ground level. Otherwise, front bumper must conform to CIK specifications. 9. Rear bumper: If CIK style bumper is not used all components shall be constructed of round, steel tubing of.750-inch nominal diameter minimum. The uppermost tangent point of the top hoop shall be 7.5 inches maximum from ground level and above the lowermost tangent point of the rear axle minimum. Minimum width shall be no less than the lateral distance between the main chassis frame rails as measured at the rear of the kart. Maximum width shall be no wider than the rear overall width of tires. Continuous loop type bumpers with vertical or angled supports are allowed. The lower bar of this type must be below the rear axle, the upper bar no higher than the top of the rear tires. Bar must be in place from frame rail to frame rail. If CIK plastic bumper is used it may extend beyond the rear tires. 10. Nerf bars: If CIK-style side pods are not utilized nerf bars must be double rail type. All components shall be constructed round, steel tubing of.750-inch nominal diameter minimum. Overall height from uppermost to lowermost tubing tangent points shall be 6.0 inches minimum. Vertical uprights are mandatory at the leading and trailing ends of the nerf bar, creating a closed, rectangular construction. The leading and trailing vertical uprights must be positioned such that the smallest gap created between the front and rear tires respectively measures 3.0 inches maximum. If CIK-style side pods are utilized nerf bars must conform to CIK specifications. 11. Seat: Must be of conventional, bucket type, molded construction, designed to keep the driver s posterior in place without undue movement. Sprint-type, sit-up seats only. Laydown-type, sprint-enduro or oval-track seats are prohibited. Minimum seat back height 13.0 inches, measured at the center of the seat back rest. The seat shall be mounted between the main frame rails. The lowermost point of the seat must be positioned no lower than the lowermost point of the adjacent frame rails and no higher than the uppermost point of the adjacent frame rails. The seat shall be positioned in such a manner that no part of the driver s head may extend aft of the vertical plane determined by the trailing edge of the rear tires, when seated normally. Headrests are not permitted. Seat Rules for CIK body work classes: Sit-up sprint style seat only, 13 minimum height cannot pass rear axle CIK style seats are defined as Sprint style bucket seats un-altered. Homemade, modified, non-production and Stallion road race seats are NOT Legal. Any attempts to circumvent this rule will be covered by the Spirit and Intent rule 12. The use of any type of suspension components is strictly prohibited. D. Super Kart Chassis Specifications 1. Main frame members shall be constructed of cold rolled, electric weld, round, steel tubing or other material of equal or greater strength, of 25mm minimum nominal outside diameter and 2mm inch minimum wall thickness. 2. Wheelbase: 50.0 inches maximum, 42.0 inches minimum. Wheelbase is measured from true axle centerlines, each side. 3. Overall width: 55.0 inches maximum, 46.0 inches minimum. Overall width is measured at any cross section of the kart, perpendicular to the longitudinal centerline axis. 4. Overall length: 96.0 inches maximum. Overall length is measured at any cross section of the kart, parallel to the longitudinal centerline axis. 5. Overall height: 30.0 inches maximum, excluding seat headrest. Overall height is measured such that all elements of the kart must pass under a bar set parallel to ground level, 30.0 inches above ground level. 6. Steering system: May be tie rod or rack and pinion system. Top of steering wheel must be at least 19.0 inches above ground level. Minimum steering shaft outside diameter is.625 inch and minimum wall thickness is.078 inch. Tie rod minimum diameter is.500 inch with minimum wall thickness of.118 inch for aluminum and.059 inch for steel. Quick disconnect steering hubs permitted. 7. Rear bumper: If CIK style bumper is not used all components shall be constructed of round, steel tubing of.750-inch nominal diameter minimum. The uppermost tangent point of the top hoop shall be 7.5 inches maximum from ground level and above the lowermost tangent point of the rear axle minimum. Minimum width shall be no less than the lateral distance between the main chassis frame rails as measured at the rear of the kart. Maximum width shall be no wider than the rear overall width of tires. Continuous loop type bumpers with vertical or angled supports are allowed. The lower bar of this type must be below the rear axle, the upper bar no higher than the top of the rear tires. Bar must be in place from frame rail to frame rail. If CIK plastic bumper is used it may extend beyond the rear tires. E. Enduro Road Racing Bodywork General Requirements (applies to sprint enduro and laydown enduro kart types) 1. All bodywork components must be constructed of high strength plastic, fiberglass, aluminum, metallic or advanced composites. If metallic materials are used there may be no sharp edges or corners. 2. No component of the bodywork may be adjusted or controlled in any way while the kart is in motion. Version Page 18 of 19